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Asian Journal of Plant Sciences > Abstract |
Asian Journal of Plant Sciences
Year: 2010 | Volume: 9 | Issue: 1 | Page No.: 51-57
DOI: 10.3923/ajps.2010.51.57
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| Mapping Quantitative Trait Loci Associated with Leaf Senescence During Maturation of Rice (Oryza sativa L.) |
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Dongzhi Lin,
Junzhi Zhang,
Hailong Zuo,
Jianlong Xu,
Lijun Luo
and Yanjun Dong
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Abstract:
In this study, the Recombinant Inbred (RI) population derived from Asominori (japonica)/ IR24 (indica) were employed to identify Quantitative Trait Loci (QTLs) for six leaf-senescence associated traits during maturation in rice, viz., the flag Leaf Chlorophyll-Content (LCC) at heading (FCH) and maturity (FCM), the second-leaf LCC at heading (SCH) and maturity (SCM), the reduction-speed of flag-leaf LCC (RFC) and the second-leaf LCC (RSC). Resultantly, all continuous variations and transgressive segregations in the RI population were observed, indicating that the six traits were quantitatively inherited. A total of eighteen QTLs for the six traits were mapped to chromosome 2 (four QTLs), 3 (four QTLs), 4 (two QTLs), 6 (two QTLs), 8 (two QTLs), 9 (two QTLs), 11, 12, which could explained 11.0 to 27.8% of the phenotypic variation. Interestingly, most LCC QTLs varied with leaf order and growth stage in rice. Among them, four QTLs for RFC and three ones for RSC, conferring the speed of flag- and the second leaf senescence, respectively, did not share the common genomic region each other and the all former alleles from japonica Asominori delayed leaf senescence and two of the latter alleles also from indica IR24, whereas the remaining one from Asominori, showing that genetic basis of leaf senescence was different between flag- and the second leaf during maturation of rice. The results and the tightly linked molecular markers that flank the QTLs detected in this study may be beneficial for selection of rice varieties with late leaf senescence. |
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